Documentation/devicetree/bindings/mfd/atmel-flexcom.txt

   1 * Device tree bindings for Atmel Flexcom (Flexible Serial Communication Unit)
   2
   3 The Atmel Flexcom is just a wrapper which embeds a SPI controller, an I2C
   4 controller and an USART. Only one function can be used at a time and is chosen
   5 at boot time according to the device tree.
   6
   7 Required properties:
   8 - compatible:           Should be "atmel,sama5d2-flexcom"
   9                         or "microchip,sam9x7-flexcom", "atmel,sama5d2-flexcom"
  10 - reg:                  Should be the offset/length value for Flexcom dedicated
  11                         I/O registers (without USART, TWI or SPI registers).
  12 - clocks:               Should be the Flexcom peripheral clock from PMC.
  13 - #address-cells:       Should be <1>
  14 - #size-cells:          Should be <1>
  15 - ranges:               Should be one range for the full I/O register region
  16                         (including USART, TWI and SPI registers).
  17 - atmel,flexcom-mode:   Should be one of the following values:
  18                         - <1> for USART
  19                         - <2> for SPI
  20                         - <3> for I2C
  21
  22 Required child:
  23 A single available child device of type matching the "atmel,flexcom-mode"
  24 property.
  25
  26 The phandle provided by the clocks property of the child is the same as one for
  27 the Flexcom parent.
  28
  29 For other properties, please refer to the documentations of the respective
  30 device:
  31 - ../serial/atmel-usart.txt
  32 - ../spi/spi_atmel.txt
  33 - ../i2c/i2c-at91.txt
  34
  35 Example:
  36
  37 flexcom@f8034000 {
  38         compatible = "atmel,sama5d2-flexcom";
  39         reg = <0xf8034000 0x200>;
  40         clocks = <&flx0_clk>;
  41         #address-cells = <1>;
  42         #size-cells = <1>;
  43         ranges = <0x0 0xf8034000 0x800>;
  44         atmel,flexcom-mode = <2>;
  45
  46         spi@400 {
  47                 compatible = "atmel,at91rm9200-spi";
  48                 reg = <0x400 0x200>;
  49                 interrupts = <19 IRQ_TYPE_LEVEL_HIGH 7>;
  50                 pinctrl-names = "default";
  51                 pinctrl-0 = <&pinctrl_flx0_default>;
  52                 #address-cells = <1>;
  53                 #size-cells = <0>;
  54                 clocks = <&flx0_clk>;
  55                 clock-names = "spi_clk";
  56                 atmel,fifo-size = <32>;
  57
  58                 flash@0 {
  59                         compatible = "atmel,at25f512b";
  60                         reg = <0>;
  61                         spi-max-frequency = <20000000>;
  62                 };
  63         };
  64 };